The hornady 200 gr xtp works but it is like a 45 +p load
Been a while since I used a G20 gen 4 but I did use underwood hardcast 220 gr and their 200 gr xtp load. I may have experienced this phenomenon but I think it was an ammo problem. Underwood did a batch of ammo with nickel plated cases that were brittle. I was getting cracked cases and early slide locking. They replaced the ammo with regular brass and what I tried seemed to have worked fine but I also used the underwood stuff sparingly due to price so maybe there just wasn't enough rounds put thru.
I would be tempted to just get the g40 for the velocity however the optics plate system means there is an eerily thin part of the slide, especially considering that it is a 10mm
That being said the g20 is one of my favorite handguns due to its versatility
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